upxtreme: Match UP Xtreme Platform enum value
upxtreme: Match UP Xtreme Platform enum value

After rebase UP Xtreme supported platform enum value was changed
to 24 in types.h, this commit updates the enum value in types.hpp
to this value.

Signed-off-by: Michael Campion <40571a2cb84056df19bb0f10fe126bb53afb6a93@emutex.com>

Propanu/mraa,intel-iot-devkit/mraa,Propanu/mraa,Propanu/mraa,g-vidal/mraa,intel-iot-devkit/mraa,intel-iot-devkit/mraa,Propanu/mraa,intel-iot-devkit/mraa,g-vidal/mraa,Propanu/mraa,g-vidal/mraa,intel-iot-devkit/mraa,g-vidal/mraa,g-vidal/mraa